TXX-6195, Interim Deficiency Rept CP-86-83 Re Use of Separation Barrier Matl on Power Cables & Raceways.Initially Reported on 861208.Util Evaluating Possibility That Conductor Temp Exceeded Insulation Temp Rating.Next Rept by 870213

Interim Deficiency Rept CP-86-83 Re Use of Separation Barrier Matl on Power Cables & Raceways.Initially Reported on 861208.Util Evaluating Possibility That Conductor Temp Exceeded Insulation Temp Rating.Next Rept by 870213

ML20207M504
Person / Time
Site:	Comanche Peak
Issue date:	01/05/1987
From:	Counsil W TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
CP-86-83, TXX-6195, NUDOCS 8701130197
Download: ML20207M504 (2)

Text

.

~

TEXAS UTILITIES GENERATING COMPANY Log # TXX-6195 BEYWAY MWER #8 f40RTH OWVE STREET. 8.5. 88 . DAM.AB. TEXAS MSI Fi1e # 10110 908.3 E'#".hN.UIL N @ @ @ ON $_

January 5, 1987 JM - 81987 Mr. Eric H. Johnson, Director -

Division of Reactor Safety and Projects _

U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50-445 AND 50-446 SEPARATION BARRIER MATERIAL ON POWER CABLES AND POWER RACEWAYS SDAR: CP-86-83 (INTERIM REPORT)

Dear Mr. Johnson:

On December 8,1986, we verbally notified your Mr. Ian Barnes of a deficiency involving the use of Separation Barrier Material (SBM) on power cables and power raceways. This is an interim report of a potentially reportable item under the provisions of 10CFR50.55(e).

CPSES design requirements do not normally allow the use of B&B "PROMATEC" fire barrier wrap system on power cables and raceways, since a large cable ampacity derating factor is required when this material is applied. Inadvertently, this material has been applied to perform as an electrical separation barrier for power cables and raceways without proper cable ampacity derating. The locations with these conditions have been documented by a Non-conformance Report (NCR). Degradation of the cable insulation could have occurred if the cables were operated in excess of the wrap derated cable ampacity during the CPSES test program.

Currently, we are evaluating the possibility that the conductor temperature of some power cables may have exceeded the insulation temperature rating. Our preliminary assessment indicates that significant inherent conservatism in cable sizing design may offset the significant ampacity derating associated with the use of this barrier material. Our preliminary evaluation is currently scheduled for completion by January 16, 1987.

8701130197 B70105 PDR ADOCK 05000445 S PDR

_, @~~J 4 omsnm or *ms amarrts risvrnic nnemi- g6'17 I.'D

.. TXX-6195

.- January 5, 1987

'Page 2 Our next report on this issue will be submitted by February 13, 1987.

Very truly yours,

1. 3 W. G. Counsil WJH/grr c - NRC Region IV (0 + 1 copy)

Director, Inspection & Enforcement (15 copies)

U. S. Nuclear Regulatory Commission Washington, D.C. 20555